Gravity models with nonlinear symmetry realization

Abstract

Three models with nonlinear realizations of conformal symmetry are discussed. The simplest model can only describe a universe expanding with a deceleration and does not include inflation. The other models are equivalent up to a variables reparametrization. All these models contain ghost degrees of freedom which may be excluded with an additional symmetry of the target space.

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• On anomalies in effective models with nonlinear symmetry realization